bzr branch
http://gegoxaren.bato24.eu/bzr/brz/remove-bazaar
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2890.2.3
by Robert Collins
* New module ``bzrlib.bisect_multi`` with generic multiple-bisection-at-once |
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# Copyright (C) 2007 Canonical Ltd
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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"""Tests for bisect_multi."""
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from bzrlib import errors |
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from bzrlib.bisect_multi import bisect_multi_bytes |
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from bzrlib.tests import TestCase |
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class TestBisectMultiBytes(TestCase): |
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def test_lookup_no_keys_no_calls(self): |
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calls = [] |
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def missing_content(location_keys): |
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calls.append(location_keys) |
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return ((location_key, False) for location_key in location_keys) |
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self.assertEqual([], |
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list(bisect_multi_bytes(missing_content, 100, []))) |
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self.assertEqual([], calls) |
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def test_lookup_missing_key_no_content(self): |
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"""Doing a lookup in a zero-length file still does a single request. |
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This makes sense because the bisector cannot tell how long content is
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and its more flexible to only stop when the content object says 'False'
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for a given location, key pair.
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"""
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calls = [] |
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def missing_content(location_keys): |
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calls.append(location_keys) |
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return ((location_key, False) for location_key in location_keys) |
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self.assertEqual([], |
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list(bisect_multi_bytes(missing_content, 0, ['foo', 'bar']))) |
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self.assertEqual([[(0, 'foo'), (0, 'bar')]], calls) |
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def test_lookup_missing_key_before_all_others(self): |
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calls = [] |
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def missing_first_content(location_keys): |
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# returns -1 for all keys unless the byte offset is 0 when it
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# returns False
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calls.append(location_keys) |
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result = [] |
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for location_key in location_keys: |
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if location_key[0] == 0: |
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result.append((location_key, False)) |
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else: |
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result.append((location_key, -1)) |
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return result |
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# given a 0 length file, this should terminate with one call.
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self.assertEqual([], |
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list(bisect_multi_bytes(missing_first_content, 0, ['foo', 'bar']))) |
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self.assertEqual([[(0, 'foo'), (0, 'bar')]], calls) |
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del calls[:] |
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# given a 2 length file, this should make two calls - 1, 0.
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self.assertEqual([], |
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list(bisect_multi_bytes(missing_first_content, 2, ['foo', 'bar']))) |
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self.assertEqual([ |
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[(1, 'foo'), (1, 'bar')], |
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[(0, 'foo'), (0, 'bar')], |
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], calls) |
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del calls[:] |
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# given a really long file - 200MB, this should make a series of calls with the
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# gap between adjactent calls dropping by 50% each time. We choose a
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# length which just under a power of two to generate a corner case in
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# bisection - naively using power of two reduction in size can lead to
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# a very long tail in the bisection process. The current users of
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# the bisect_multi_bytes api are not expected to be concerned by this,
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# as the delta gets down to 4K (the minimum we expect to read and
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# parse) within 16 steps even on a 200MB index (which at 4 keys/K is
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# 800 thousand keys, and log2 of 800000 is 19 - so we're doing log2
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# steps in the worst case there.
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self.assertEqual([], |
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list(bisect_multi_bytes( |
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missing_first_content,268435456 - 1 , ['foo', 'bar']))) |
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self.assertEqual([ |
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[(134217727, 'foo'), (134217727, 'bar')], |
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[(67108864, 'foo'), (67108864, 'bar')], |
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[(33554433, 'foo'), (33554433, 'bar')], |
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[(16777218, 'foo'), (16777218, 'bar')], |
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[(8388611, 'foo'), (8388611, 'bar')], |
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[(4194308, 'foo'), (4194308, 'bar')], |
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[(2097157, 'foo'), (2097157, 'bar')], |
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[(1048582, 'foo'), (1048582, 'bar')], |
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[(524295, 'foo'), (524295, 'bar')], |
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[(262152, 'foo'), (262152, 'bar')], |
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[(131081, 'foo'), (131081, 'bar')], |
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[(65546, 'foo'), (65546, 'bar')], |
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[(32779, 'foo'), (32779, 'bar')], |
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[(16396, 'foo'), (16396, 'bar')], |
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[(8205, 'foo'), (8205, 'bar')], |
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[(4110, 'foo'), (4110, 'bar')], |
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[(2063, 'foo'), (2063, 'bar')], |
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[(1040, 'foo'), (1040, 'bar')], |
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[(529, 'foo'), (529, 'bar')], |
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[(274, 'foo'), (274, 'bar')], |
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[(147, 'foo'), (147, 'bar')], |
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[(84, 'foo'), (84, 'bar')], |
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[(53, 'foo'), (53, 'bar')], |
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[(38, 'foo'), (38, 'bar')], |
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[(31, 'foo'), (31, 'bar')], |
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[(28, 'foo'), (28, 'bar')], |
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[(27, 'foo'), (27, 'bar')], |
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[(26, 'foo'), (26, 'bar')], |
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[(25, 'foo'), (25, 'bar')], |
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[(24, 'foo'), (24, 'bar')], |
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[(23, 'foo'), (23, 'bar')], |
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[(22, 'foo'), (22, 'bar')], |
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[(21, 'foo'), (21, 'bar')], |
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[(20, 'foo'), (20, 'bar')], |
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[(19, 'foo'), (19, 'bar')], |
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[(18, 'foo'), (18, 'bar')], |
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[(17, 'foo'), (17, 'bar')], |
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[(16, 'foo'), (16, 'bar')], |
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[(15, 'foo'), (15, 'bar')], |
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[(14, 'foo'), (14, 'bar')], |
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[(13, 'foo'), (13, 'bar')], |
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[(12, 'foo'), (12, 'bar')], |
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[(11, 'foo'), (11, 'bar')], |
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[(10, 'foo'), (10, 'bar')], |
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[(9, 'foo'), (9, 'bar')], |
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[(8, 'foo'), (8, 'bar')], |
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[(7, 'foo'), (7, 'bar')], |
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[(6, 'foo'), (6, 'bar')], |
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[(5, 'foo'), (5, 'bar')], |
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[(4, 'foo'), (4, 'bar')], |
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[(3, 'foo'), (3, 'bar')], |
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[(2, 'foo'), (2, 'bar')], |
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[(1, 'foo'), (1, 'bar')], |
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[(0, 'foo'), (0, 'bar')], |
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], calls) |
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def test_lookup_missing_key_after_all_others(self): |
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calls = [] |
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end = None |
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def missing_last_content(location_keys): |
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# returns +1 for all keys unless the byte offset is 'end' when it
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# returns False
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calls.append(location_keys) |
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result = [] |
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for location_key in location_keys: |
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if location_key[0] == end: |
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result.append((location_key, False)) |
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else: |
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result.append((location_key, +1)) |
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return result |
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# given a 0 length file, this should terminate with one call.
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end = 0 |
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self.assertEqual([], |
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list(bisect_multi_bytes(missing_last_content, 0, ['foo', 'bar']))) |
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self.assertEqual([[(0, 'foo'), (0, 'bar')]], calls) |
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del calls[:] |
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end = 2 |
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# given a 3 length file, this should make two calls - 1, 2.
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self.assertEqual([], |
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list(bisect_multi_bytes(missing_last_content, 3, ['foo', 'bar']))) |
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self.assertEqual([ |
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[(1, 'foo'), (1, 'bar')], |
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[(2, 'foo'), (2, 'bar')], |
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], calls) |
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del calls[:] |
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end = 268435456 - 2 |
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# see the really-big lookup series in
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# test_lookup_missing_key_before_all_others for details about this
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# assertion.
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self.assertEqual([], |
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list(bisect_multi_bytes( |
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missing_last_content,268435456 - 1 , ['foo', 'bar']))) |
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self.assertEqual([ |
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[(134217727, 'foo'), (134217727, 'bar')], |
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[(201326590, 'foo'), (201326590, 'bar')], |
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[(234881021, 'foo'), (234881021, 'bar')], |
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[(251658236, 'foo'), (251658236, 'bar')], |
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[(260046843, 'foo'), (260046843, 'bar')], |
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[(264241146, 'foo'), (264241146, 'bar')], |
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[(266338297, 'foo'), (266338297, 'bar')], |
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[(267386872, 'foo'), (267386872, 'bar')], |
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[(267911159, 'foo'), (267911159, 'bar')], |
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[(268173302, 'foo'), (268173302, 'bar')], |
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[(268304373, 'foo'), (268304373, 'bar')], |
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[(268369908, 'foo'), (268369908, 'bar')], |
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[(268402675, 'foo'), (268402675, 'bar')], |
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[(268419058, 'foo'), (268419058, 'bar')], |
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[(268427249, 'foo'), (268427249, 'bar')], |
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[(268431344, 'foo'), (268431344, 'bar')], |
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[(268433391, 'foo'), (268433391, 'bar')], |
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[(268434414, 'foo'), (268434414, 'bar')], |
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[(268434925, 'foo'), (268434925, 'bar')], |
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[(268435180, 'foo'), (268435180, 'bar')], |
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[(268435307, 'foo'), (268435307, 'bar')], |
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[(268435370, 'foo'), (268435370, 'bar')], |
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[(268435401, 'foo'), (268435401, 'bar')], |
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[(268435416, 'foo'), (268435416, 'bar')], |
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[(268435423, 'foo'), (268435423, 'bar')], |
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[(268435426, 'foo'), (268435426, 'bar')], |
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[(268435427, 'foo'), (268435427, 'bar')], |
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[(268435428, 'foo'), (268435428, 'bar')], |
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[(268435429, 'foo'), (268435429, 'bar')], |
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[(268435430, 'foo'), (268435430, 'bar')], |
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[(268435431, 'foo'), (268435431, 'bar')], |
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[(268435432, 'foo'), (268435432, 'bar')], |
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[(268435433, 'foo'), (268435433, 'bar')], |
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[(268435434, 'foo'), (268435434, 'bar')], |
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[(268435435, 'foo'), (268435435, 'bar')], |
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[(268435436, 'foo'), (268435436, 'bar')], |
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[(268435437, 'foo'), (268435437, 'bar')], |
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[(268435438, 'foo'), (268435438, 'bar')], |
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[(268435439, 'foo'), (268435439, 'bar')], |
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[(268435440, 'foo'), (268435440, 'bar')], |
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[(268435441, 'foo'), (268435441, 'bar')], |
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[(268435442, 'foo'), (268435442, 'bar')], |
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[(268435443, 'foo'), (268435443, 'bar')], |
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[(268435444, 'foo'), (268435444, 'bar')], |
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[(268435445, 'foo'), (268435445, 'bar')], |
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[(268435446, 'foo'), (268435446, 'bar')], |
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[(268435447, 'foo'), (268435447, 'bar')], |
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[(268435448, 'foo'), (268435448, 'bar')], |
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[(268435449, 'foo'), (268435449, 'bar')], |
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[(268435450, 'foo'), (268435450, 'bar')], |
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[(268435451, 'foo'), (268435451, 'bar')], |
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[(268435452, 'foo'), (268435452, 'bar')], |
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[(268435453, 'foo'), (268435453, 'bar')], |
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[(268435454, 'foo'), (268435454, 'bar')] |
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], calls) |
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def test_lookup_when_a_key_is_missing_continues(self): |
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calls = [] |
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def missing_foo_otherwise_missing_first_content(location_keys): |
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# returns -1 for all keys unless the byte offset is 0 when it
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# returns False
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calls.append(location_keys) |
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result = [] |
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for location_key in location_keys: |
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if location_key[1] == 'foo' or location_key[0] == 0: |
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result.append((location_key, False)) |
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else: |
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result.append((location_key, -1)) |
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return result |
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# given a 2 length file, this should terminate with two calls, one for
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# both keys, and one for bar only.
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self.assertEqual([], |
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list(bisect_multi_bytes( |
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missing_foo_otherwise_missing_first_content, 2, |
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['foo', 'bar']))) |
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self.assertEqual([ |
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[(1, 'foo'), (1, 'bar')], |
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[(0, 'bar')], |
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], calls) |
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def test_found_keys_returned_other_searches_continue(self): |
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calls = [] |
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def find_bar_at_1_foo_missing_at_0(location_keys): |
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calls.append(location_keys) |
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result = [] |
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for location_key in location_keys: |
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if location_key == (1, 'bar'): |
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result.append((location_key, 'bar-result')) |
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elif location_key[0] == 0: |
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result.append((location_key, False)) |
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else: |
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result.append((location_key, -1)) |
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return result |
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# given a 4 length file, this should terminate with three calls, two for
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# both keys, and one for foo only.
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self.assertEqual([('bar', 'bar-result')], |
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list(bisect_multi_bytes( |
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find_bar_at_1_foo_missing_at_0, 4, |
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['foo', 'bar']))) |
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self.assertEqual([ |
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[(2, 'foo'), (2, 'bar')], |
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[(1, 'foo'), (1, 'bar')], |
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[(0, 'foo')], |
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], calls) |
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def test_searches_different_keys_in_different_directions(self): |
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calls = [] |
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def missing_bar_at_1_foo_at_3(location_keys): |
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calls.append(location_keys) |
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result = [] |
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for location_key in location_keys: |
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if location_key[1] == 'bar': |
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if location_key[0] == 1: |
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result.append((location_key, False)) |
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else: |
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# search down
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result.append((location_key, -1)) |
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elif location_key[1] == 'foo': |
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if location_key[0] == 3: |
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result.append((location_key, False)) |
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else: |
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# search up
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result.append((location_key, +1)) |
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return result |
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# given a 4 length file, this should terminate with two calls.
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self.assertEqual([], |
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list(bisect_multi_bytes( |
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missing_bar_at_1_foo_at_3, 4, |
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['foo', 'bar']))) |
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self.assertEqual([ |
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[(2, 'foo'), (2, 'bar')], |
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[(3, 'foo'), (1, 'bar')], |
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], calls) |
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def test_change_direction_in_single_key_search(self): |
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# check that we can search down, up, down again -
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# so length 8, goes 4, 6, 5
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calls = [] |
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def missing_at_5(location_keys): |
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calls.append(location_keys) |
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result = [] |
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for location_key in location_keys: |
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if location_key[0] == 5: |
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result.append((location_key, False)) |
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elif location_key[0] > 5: |
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# search down
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result.append((location_key, -1)) |
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else: |
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# search up
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result.append((location_key, +1)) |
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return result |
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# given a 8 length file, this should terminate with three calls.
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self.assertEqual([], |
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list(bisect_multi_bytes( |
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missing_at_5, 8, |
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['foo', 'bar']))) |
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self.assertEqual([ |
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[(4, 'foo'), (4, 'bar')], |
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[(6, 'foo'), (6, 'bar')], |
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[(5, 'foo'), (5, 'bar')], |
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], calls) |
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